首页> 外文期刊>RSC Advances >Relativistic effects on the Te-125 and S-33 NMR chemical shifts of various tellurium and sulfur species, together with Se-77 of selenium congeners, in the framework of a zeroth-order regular approximation: applicability to tellurium compounds
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Relativistic effects on the Te-125 and S-33 NMR chemical shifts of various tellurium and sulfur species, together with Se-77 of selenium congeners, in the framework of a zeroth-order regular approximation: applicability to tellurium compounds

机译:在零级正则逼近的框架内,对碲和硫物种以及硒同族元素的Se-77对Te-125和S-33 NMR化学位移的相对论影响:对碲化合物的适用性

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摘要

The relativistic effects on absolute magnetic shielding tensors [sigma(Z: Z = Te, Se and S)] are explicitly evaluated for various tellurium, selenium and sulfur species using the DFT(BLYP)-GIAO method. Calculations of sigma(Te), sigma(Se) and sigma(S) are performed under the spin-orbit ZORA relativistic (Rlt-so) and nonrelativistic (Non) conditions with the Slater-type basis sets of the quadruple zeta all electron with four polarization functions (QZ4Pae). Structures optimized at the MP2 level under nonrelativistic conditions are employed for the evaluations. While the range of the relativistic effects on the total shielding tensors for Te (Delta sigma(t)(Te)(Rlt-so) = sigma(t)(Te)(Rlt-so) - sigma(d+p)(Te)(Non)) is predicted to be -55 to 658 ppm, that for Delta sigma(t)(S) is predicted to be 5 to 32 ppm, except for Me2SBr2 (TBP), where Delta sigma(t)(S)(Rlt-so) = -29 ppm. The range for Delta sigma(t)(Se) is 2 to 153 ppm. The magnitudes of the relativistic effects on sigma(t)(Te), sigma(t)(Se) and sigma(t)(S) are about 25 : 5 : 1. The applicability of sigma(t)(Te)(Rlt-so) to analyze delta(Te)(obsd) is also examined, mainly with the OPBE//OPBE method under the spin-orbit ZORA relativistic conditions with QZ4Pae, in addition to the above method.
机译:使用DFT(BLYP)-GIAO方法明确评估了各种碲,硒和硫物种对绝对磁屏蔽张量[sigma(Z:Z = Te,Se和S)]的相对论效应。在自旋轨道ZORA相对论(Rlt-so)和非相对论(Non)条件下使用四重zeta所有电子的Slater型基组进行sigma(Te),sigma(Se)和sigma(S)的计算四个极化函数(QZ4Pae)。在非相对论条件下在MP2级别优化的结构用于评估。相对论对Te的总屏蔽张量的影响范围(Delta sigma(t)(Te)(Rlt-so)= sigma(t)(Te)(Rlt-so)-sigma(d + p)(Te )(Non))预计为-55至658 ppm,对于Delta sigma(t)(S)的预测值为5至32 ppm,但Me2SBr2(TBP)除外,其中Delta sigma(t)(S) (Rlt-so)= -29 ppm。 Δsigma(t)(Se)的范围是2至153 ppm。相对论对sigma(t)(Te),sigma(t)(Se)和sigma(t)(S)的影响约为25:5:1。sigma(t)(Te)(Rlt)的适用性-so)分析δ(Te)(obsd),除上述方法外,还主要使用带有QZ4Pae的自旋轨道ZORA相对论条件下的OPBE // OPBE方法。

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